往复式高压注水泵泵头复合强化工艺

Compound technology for fluid cylinder on high pressure waterflooding pumps

决定往复式高压注水泵工作可靠性的关键因素是泵头（阀箱）的工作寿命。运用断裂力学、金属学、疲劳损伤、金属强化、有限元分析和机械制造工艺等理论和方法，提出了泵头复合强化工艺，即首先对泵头内腔表面实施薄壳硬化自增强处理，使该内表面具有压应力场；随后对此内表面进行强力喷丸，使之最终获得最佳残余压应力场，从而大大提高泵头的疲劳断裂抗力和应力腐蚀（含氢脆）断裂抗力。研究表明，由强力喷丸引入薄壳硬化层的残余压应力场和塑变引起的γ－α相变，是提高泵头疲劳强度的两个重要因素。

By using the theory and method of fracture mechanics, metallography,finite element analysis,and machinery manufacturing technolop, the compound strengthening technology for the fluid cylinder on a high pressure waterflooding reciprocating pump is presented,i.e.carrying out shell hardening selfstrengthening on the inner surface of the fluid cylinder to produce compressive stress field on the surface,then exerting intensive shot peening onto the surface to create an optimum residual compressive stress field to improve the fatigue fracture resistance and stress corrosion fracture resistance of the fluid cylinder.Investigation shows that the residual compressive stress field produced by the shot peening and the γ-αphase transformation caused by plastic deformation are two important factors for improving the fatigue strength of the fluid cylinder.